Turbine shroud with movable attachment features

ABSTRACT

A turbine shroud for positioning radially outside of blades of a turbine rotor includes a carrier, a blade track, and a track attachment system. The blade track is moved radially outwardly into a cavity of the carrier, and the track attachment system is adjusted to block radially inward movement of the blade track out of the cavity.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority to and the benefit of U.S. ProvisionalPatent Application No. 62/186,878, filed 30 Jun. 2016, the disclosure ofwhich is now expressly incorporated herein by reference.

FIELD OF THE DISCLOSURE

The present disclosure relates generally to gas turbine engines, andmore specifically to turbine shrouds used in gas turbine engines.

BACKGROUND

Gas turbine engines are used to power aircraft, watercraft, powergenerators, and the like. Gas turbine engines typically include acompressor, a combustor, and a turbine. The compressor compresses airdrawn into the engine and delivers high pressure air to the combustor.In the combustor, fuel is mixed with the high pressure air and isignited. Products of the combustion reaction in the combustor aredirected into the turbine where work is extracted to drive thecompressor and, sometimes, an output shaft, fan, or propeller. Left-overproducts of the combustion are exhausted out of the turbine and mayprovide thrust in some applications.

Compressors and turbines typically include alternating stages of staticvane assemblies and rotating wheel assemblies. The rotating wheelassemblies include disks carrying blades around their outer edges. Whenthe rotating wheel assemblies turn, tips of the blades move along bladetracks included in static shrouds that are arranged around the rotatingwheel assemblies. Such static shrouds may be coupled to an engine casethat surrounds the compressor, the combustor, and the turbine.

Some shrouds are made up of a number of segments arrangedcircumferentially adjacent to one another to form a ring. Blade tracksof such shrouds block gas from leaking through the shroud duringoperation of the gas turbine engine. Thus, more gas is forced to passover the blades included in the rotating wheel assemblies which extractwork from the gas.

SUMMARY

The present disclosure may comprise one or more of the followingfeatures and combinations thereof.

According to an aspect of the disclosure, a segmented turbine shroudextends around a central axis and includes a carrier segment thatextends partway around the central axis and that forms a radiallyinwardly-opening cavity surrounded on four sides, a blade track segmentincluding ceramic-containing materials and being formed to include arunner that extends partway around the central axis and a positionerattachment post that extends radially outward from the runner into theradially inwardly-opening cavity of the carrier segment, the positionerattachment post formed to include a track-positioning surface thatextends both radially and axially, and a track attachment system adaptedto couple the blade track segment to the carrier segment. The trackattachment system includes a positioner coupled to the carrier segmentto move axially from a disengaged position out of contact with thepositioner attachment post to an engaged position contacting thepositioner attachment post to engage the track-positioning surface ofthe positioner attachment post with a position-setting surface thatextends both radially and axially at an angle corresponding to that ofthe track-positioning surface.

In some embodiments, the position-setting surface is formed by thepositioner.

In some embodiments, the positioner is formed to include positionerthreads that engage corresponding threads formed in the carrier segment.

In some embodiments, the position-setting surface is formed by thecarrier segment.

In some embodiments, the blade track segment includes a retainerattachment post that extends radially outward into the radiallyinwardly-opening cavity of the carrier segment for arrangement withinthe inwardly-opening cavity of the carrier segment.

In some embodiments, the track attachment system includes a retainercoupled to the carrier segment to move axially from a disengagedposition arranged to allow radially outward movement of the retainerattachment post into the radially inwardly-opening cavity of the carriersegment to an engaged position arranged to block radially inwardmovement of the retainer attachment post out of the radiallyinwardly-opening cavity of the carrier segment.

In some embodiments, the retainer attachment post has an L-shaped crosssectional profile, the L-shaped cross sectional profile includes agenerally radially extending portion and a generally axially extendingportion, and the retainer of the track attachment system is arrangedradially inward of the axially extending portion when the retainer is inthe engaged position.

In some embodiments, the track attachment system includes a step formedintegrally with the carrier segment and arranged to contact a radiallyinner surface of the retainer attachment post to block radially inwardmovement of the retainer attachment post out of the radiallyinwardly-opening cavity of the carrier segment when the positioner is inthe engaged position.

In some embodiments, the retainer attachment post has an L-shaped crosssectional profile, the L-shaped cross sectional profile includes agenerally radially extending portion and a generally axially extendingportion, and the step of the track attachment system is arrangedradially inward of the axially extending portion when the retainerattachment post is within the inwardly-opening cavity of the carriersegment.

In some embodiments, the carrier comprises a forward side wall, an aftside wall, a first circumferential end cap, and a second circumferentialend cap that cooperate to define the radially inwardly-opening cavity ofthe carrier segment, the first circumferential end cap is formed toinclude a circumferentially-opening strip-seal slot sized to receive astrip seal, and the second circumferential end cap is formed to includea circumferentially-opening strip-seal slot sized to receive a stripseal.

According to another aspect of the disclosure, a segmented turbineshroud extends around a central axis and includes a carrier segment thatextends partway around the central axis and that forms a radiallyinwardly-opening cavity surrounded on four sides, a blade track segmentincluding ceramic-containing materials and being formed to include arunner that extends partway around the central axis and a retainerattachment post that extends radially outwardly into the radiallyinwardly-opening cavity of the carrier segment, and a track attachmentsystem adapted to couple the blade track segment to the carrier segment.The track retainer system including a retainer coupled to the carriersegment to move axially from a disengaged position arranged to allowradially outward movement of the retainer attachment post into theradially inwardly-opening cavity of the carrier segment to an engagedposition arranged to block radially inward movement of the retainerattachment post out of the radially inwardly-opening cavity of thecarrier segment.

In some embodiments, the retainer attachment post has an L-shaped crosssectional profile, the L-shaped cross sectional profile includes agenerally radially extending portion and a generally axially extendingportion, and the retainer of the track attachment system is arrangedradially inward of the axially extending portion when the retainer is inthe engaged position.

In some embodiments, the blade track segment includes a metallic insertthat extends radially inward from the axially extending portion of theL-shaped cross sectional profile of the retainer attachment post andthat is directly engaged by the retainer of the track attachment systemwhen the retainer is in the engaged position.

In some embodiments, the blade track segment includes a positionerattachment post that extends radially outward into the radiallyinwardly-opening cavity of the carrier segment, the positionerattachment post formed to include a track-positioning surface thatextends both radially and axially, and the track attachment systemincluding a positioner coupled to the carrier segment to move axiallyfrom a disengaged position out of contact with the positioner attachmentpost to an engaged position contacting the positioner attachment post toengage the track-positioning surface of the positioner attachment postwith a position-setting surface that extends both radially and axially.

In some embodiments, the position-setting surface is formed by thepositioner.

In some embodiments, the position-setting surface is formed by thecarrier segment.

In some embodiments, the retainer attachment post has an L-shaped crosssectional profile, the L-shaped cross sectional profile includes agenerally radially extending portion and a generally axially extendingportion, the axially extending portion of the L-shaped cross sectionalprofile has an end face surface that extends both radially and axially,and the end face surface engages an face engagement surface formed bythe carrier segment that extends both axially and radially along anangle corresponding to that of the end face surface when the position isin the engaged position.

In some embodiments, the carrier comprises a forward side wall, an aftside wall, a first circumferential end cap, and a second circumferentialend cap that cooperate to define the radially inwardly-opening cavity ofthe carrier segment, the first circumferential end cap is formed toinclude a circumferentially-opening strip-seal slot sized to receive astrip seal, and the second circumferential end cap is formed to includea circumferentially-opening strip-seal slot sized to receive a stripseal.

According to another aspect of the disclosure, a method of assembling asegmented turbine shroud that extends around a central axis includesmoving a blade track segment formed to include a runner, a retainerpost, and a positioner post radially outward so that the retainer postand the positioner post are received in a radially inwardly openingcavity formed by a carrier segment, and attaching the blade tracksegment to the carrier segment with a track attachment system by (i)contacting the retainer post with the carrier, and (ii) moving apositioner coupled to the carrier axially from a disengaged position outof contact with the positioner post to an engaged position contactingthe positioner post to engage a track-positioning surface of thepositioner post with a position-setting surface that extends bothradially and axially at an angle corresponding to an angle of thetrack-positioning surface, by rotating the positioner relative to thecarrier segment so that positioner threads included in the positionerengage corresponding threads formed in the carrier segment to causeaxial movement of the positioner.

In some embodiments, contacting the retainer post includes rotating aretainer of the carrier segment relative to the carrier segment so thatretainer threads included in the retainer engage corresponding threadsformed in the carrier segment to cause axial movement of the retainer.

These and other features of the present disclosure will become moreapparent from the following description of the illustrative embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partial perspective view of gas turbine assembly accordingto the present disclosure with a portion cut away showing that theassembly includes a fan, a compressor, and a turbine including asegmented turbine shroud;

FIG. 2 is a cross-sectional view of a portion of the turbine shown inFIG. 1 showing that the turbine shroud includes a carrier, a bladetrack, and a track attachment system for attaching the blade track tothe carrier;

FIG. 3 is a cross-sectional view of a portion of the turbine shown inFIGS. 1 and 2 showing that the carrier of the turbine shroud includes acarrier segment having a segment end that has a strip-seal slot sized toreceive a strip-seal;

FIG. 4 is a detailed cross-sectional view of illustrative embodiments ofthe turbine shroud of FIGS. 1 and 2 taken at a different cross-sectionallocation showing that the track attachment system includes a positionerthreadedly engaged with the carrier to move axially from a disengagedposition to an engaged position contacting a positioner post included inthe blade track urging a track-positioning surface of the positionerpost into engagement with a position-setting surface of the positionerand a retainer threadedly engaged with the carrier to move axially intoan engaged position contacting an L-shaped retainer post included in theblade track;

FIG. 5 is a detailed cross-sectional view of a second track attachmentsystem adapted for use in the turbine shroud of FIGS. 1-3 showing thatthe track attachment system includes a positioner threadedly engagedwith the carrier to move axially from a disengaged position to anengaged position contacting a positioner post included in the bladetrack urging a track-positioning surface of the positioner post intoengagement with a position-setting surface of the carrier and a retainerthreadedly engaged with the carrier to move axially into an engagedposition contacting a retainer post included in the blade track;

FIG. 6 is a detailed cross-sectional view of a third track attachmentsystem adapted for use in the turbine shroud of FIGS. 1-3 showing thatthe retainer of the track attachment system is a step formed integrallywith the carrier and arranged to contact the retainer post of the bladetrack segment to block radially inward movement of a retainer post outof the inwardly-opening cavity of the carrier segment when thepositioner is in the engaged position;

FIG. 7 is a detailed cross-sectional view of fourth track attachmentsystem adapted for use in the turbine shroud of FIGS. 1-3 showing thatthe retainer of the track attachment system is a step formed integrallywith the carrier and arranged to contact the retainer post of the bladetrack segment to block radially inward movement of the retainer post outof the inwardly-opening cavity of the carrier segment when thepositioner is in the engaged position;

FIG. 8 is a cross-sectional view of an illustrative assembly process ofthe turbine shroud of FIGS. 1-4 that is also generally applicable to theturbine shroud of FIG. 5 showing radial movement of the blade tracksegment and axial movement of the positioner and the retainer;

FIG. 9 is a cross-sectional view of an illustrative assembly process ofthe turbine shroud of FIG. 6 that is also generally applicable to theturbine shroud of FIG. 7 showing radial movement of the blade tracksegment and axial movement of the positioner.

DETAILED DESCRIPTION OF THE DRAWINGS

For the purposes of promoting an understanding of the principles of thedisclosure, reference will now be made to a number of illustrativeembodiments illustrated in the drawings and specific language will beused to describe the same.

An illustrative gas turbine engine 10 with a portion cut away is shownin FIG. 1 to illustrate that the engine 10 includes a fan 12, acompressor 14, a combustor 16, and a turbine 18. The fan 12 is driven bythe turbine 18 and provides thrust for driving a load (not shown), forexample propulsion of an air vehicle. The compressor 14 compresses anddelivers air to the combustor 16. The combustor 16 mixes fuel with thecompressed air from the compressor 14 and combusts the mixture. The hot,high-pressure exhaust products of the combustion reaction in thecombustor 16 are directed into the turbine 18 to cause the turbine 18 torotate about an axis 20 and drive the compressor 14 and the fan 12.

Referring now to FIG. 2, a portion of the turbine 18 is shown to includestatic turbine vane assembly 22 and a turbine wheel assembly 24. Thevane assembly 22 extends across the flow path of the hot, high-pressureexhaust products from the combustor 16 to direct the exhaust towardblades 26 of the turbine wheel assembly 24. The flow of combustionexhaust applies force to the blades 26 to cause the turbine wheelassembly 24 to rotate, thereby driving the rotating components of thecompressor 14 and the fan 12.

The turbine 18 also includes a turbine shroud 28 that extends aroundturbine wheel assembly 24 to encourage combustion exhaust to flow in amanner that applies force to the blades 26 as shown in FIGS. 2 and 3.Combustion exhaust that passes over the blades 26 does not apply forceto the blades 26 and such pass-over exhaust creates operationalperformance loss. Turbine shroud 28 is illustratively comprised of aplurality of turbine shroud segments 28 a arranged within a casing 30 toform an annular ring as suggested in FIGS. 1 and 2.

The turbine shroud 28 includes a carrier 34, a blade track 42, and atrack attachment system 44, as shown in FIG. 2. The carrier 34 isillustratively attached to the casing 30 and is configured to engage theblade track 42 through the track attachment system 44 suggested in FIG.2. The track attachment system 44 couples the blade track 42 to thecarrier 34 by engagement of ramped surfaces as suggested in FIG. 2.

The track attachment system 44 includes a positioner 46, illustrated asa custom set screw, as shown in FIG. 4. The positioner 46 isillustratively coupled to the carrier 34 for axial movement between adisengaged position (suggested in FIG. 8) and an engaged position(suggested in FIG. 4). In the disengaged position, the positioner 46 isillustratively arranged out of contact with the blade track 42 of thecarrier 34 to permit radial movement of the blade track 42 into aradially inwardly-opening cavity 48 of the carrier as suggested in FIG.8. In the engaged position, the positioner 46 is illustratively arrangedin contact with the blade track to block radial movement of the bladetrack 42 out of the cavity 48 of the carrier 43 and to set the positionof the blade track 42 relative to the carrier 34 as suggested in FIG. 4.

The track attachment system 44 also includes a retainer 50, illustratedas a custom set screw, illustratively shown in FIG. 4. The retainer 50is illustratively coupled to the carrier for axial movement between adisengaged position (suggested in FIG. 8) and an engaged position(suggested in FIG. 4). In the disengaged position, the retainer 50 isillustratively arranged out of contact with the blade track 42 of thecarrier 34 to permit radial movement of the blade track 42 into theradially inwardly-opening cavity 48 of the carrier 34 as suggested inFIG. 8. In the engaged position, the retainer 50 is illustrativelyarranged in contact with the blade track to block radial movement of theblade track 42 out of the radially inwardly-opening cavity 48 of thecarrier 43 as suggested in FIG. 4.

The blade track 42 includes a runner 52, a positioner attachment post54, and a retainer attachment post 56 as shown in FIG. 4. The attachmentposts 54, 56 each extend radially outward from the runner 52 assuggested in FIG. 4. The attachment posts 54, 56 are illustrativelyarranged within the cavity 48 of the carrier 34 to couple the bladetrack 42 to the carrier 34. The positioner attachment post 54illustratively includes a track-positioning surface 58 that extends bothaxially and radially at an angle. The track-positioning surface 58 isconfigured for contact with a position-setting surface 60 of thepositioner 46 to block movement of the blade track 42 out of the cavity48 of the carrier 34 and to orient the blade track 42 relative to thecarrier 34. When the blade track 42 is arranged within the cavity 48 andthe positioner 46 is in the engaged position contacting the positionerattachment post 54, the track-positioning surface 58 is urged intoengagement with the position-setting surface 60 as suggested in FIG. 4.

The position-setting surface 60 of the positioner 46 extends radiallyand axially at an angle corresponding to that of the track-positioningsurface 58 and is configured for engagement with the track-positioningsurface 58 as suggested in FIG. 4. In illustrative embodiments assuggested in FIG. 4, the position-setting surface 60 is illustrativelyformed on an end of the positioner 46 and moves with the positioner 46between the disengaged and the engaged positions. The track-positioningsurface 58 is illustratively formed on an aft side of the positionerattachment post 54 and is configured for contact with theposition-setting surface 60 to engage the position-setting surface 60 ofthe positioner 46 and establish a ramped attachment while in the engagedposition. Upon full engagement of the positioner 46, a radially outersurface of the positioner attachment post 54 contacts the carrier tolocate the blade track 42. Accordingly, in some embodiments, theradially outer surface of the positioner attachment post 54 is machinedto a tight tolerance generally perpendicular to CMC fibers included inthe blade track 42.

In illustrative embodiments, the retainer attachment post 56 has anL-shaped cross-sectional profile as suggested in FIG. 4. The L-shapedcross-sectional profile includes a generally radially extending portion66 and a generally axially extending portion 68 as suggested in FIGS. 4.The generally radially extending portion 66 is illustratively connectedon one end to a radially outer surface of the runner 52 and on the otherend to an end of the generally axially extending portion 68.

In illustrative embodiments, the blade track 42 includes an end face 74as suggested in FIG. 4. The end face 74 is illustratively formed on aside of the retainer attachment post 56. The end face 74 isillustratively configured for engagement with a face engagement surface76 formed by the carrier complimentarily to the end face 74. The faceengagement surface 76 of the carrier 34 is illustratively formed by acompliant high temperature gasket that is more compliant than thecarrier 34 and the blade track 42. In some embodiments, the end face 74and the face engagement surface 76 are configured for contact with eachother but are positioned in spaced apart relation to permit limitedaxial translation of the blade track 42.

In illustrative embodiments, the retainer attachment post 56 includes aninsert member 80 as suggested in FIG. 4. The insert member 80illustratively includes an end formed on a radially outward side thereofand configured for insertion into a depression 78 formed on a radiallyinward side of the generally axially extending portion 68 of theretainer attachment post 56 as suggested in FIG. 4. The insert member 80is illustratively formed of a least one sacrificial layer to easecontact between the blade track 42 and carrier 34. The insert member 80is illustratively configured to extend radially inwardly from thedepression 78 to contact an upper surface of the retainer 50 to blockradially inward movement of the retainer attachment post 56 out of theradially inwardly-opening cavity 48. The insert member 80 allows formachining into a metal instead of CMC fibers when setting specificengagement points of the assembly.

In illustrative embodiments, the turbine shroud 28 is a segmentedturbine shroud comprised of a plurality of turbine shroud segments 28 aas suggested in FIG. 3. The carrier 34 is illustratively comprised of aplurality of segmented carrier segments 34 a having a forward side wall62 and an aft side wall 64 and having first and second circumferentialend caps 70 as suggested in FIG. 3. The forward and aft side walls 62,64 and the first and second circumferential end caps 70 are configuredto define the radially inwardly-opening cavity 48 inside the carrier 34as suggested in FIG. 3. The radially inwardly-opening cavity 48 of thecarrier 34 is configured to receive the attachment posts 54, 56 of theblade track 42. The circumferential end caps 70 illustratively include acircumferentially-opening strip-seal slot 72 configured to receive aseal strip to provide sealing between the carrier segments 34 a.

In illustrative embodiments, the positioner 46 of the track attachmentsystem 44 includes external threads 90 disposed on an outer surfacethereof as suggested in FIG. 4. The external threads 90 are configuredto engage corresponding internal threads 91 of carrier 34.Illustratively, engagement of the external 90 and internal 91 threadspermits adjustment of the positioner 46 between the disengaged and theengaged positions.

In illustrative embodiments, the retainer 50 of the track attachmentsystem 44 illustratively includes external threads 92 disposed on anouter surface thereof as suggested in FIG. 4. The external threads areconfigured to engage with corresponding internal threads 93 of carrier34. Illustratively, engagement of the external 92 and internal threads93 permits adjustment of the retainer 50 between the disengaged and theengaged positions. In some embodiments, the retainer 50 may comprise acam pin configured to permit adjustment of a radial height of a point ofcontact with the insert member 80 of the blade track 42.

In illustrative embodiments, the track attachment system 44 includesmultiple positioners 46. Positioners 46 are illustratively positionedcircumferentially at evenly spaced positions around the carrier 34 topermit attachment of the blade track 42. In illustrative embodiments,each carrier segment 34 a includes three positioners 46.

In illustratively embodiments, the track attachment system 44 includesmultiple retainers 50. Retainers 50 are illustratively positionedcircumferentially at evenly spaced positions around the carrier 34 topermit attachment of the blade track 42. In illustrative embodiments,each carrier segment 34 a includes three retainers 50. In someembodiments, the retainers 50 are formed of a single step that isintegral with the carrier segment 34 a and extends along the length ofthe carrier segment 34 a.

According to one illustrative method of assembling the turbine shroud28, while the positioner 46 and the retainer 50 are in their disengagedpositions, the blade track 42 is moved radially outward such that thefirst and retainer attachment posts 54, 56 are received within theinwardly-opening cavity 48 of the carrier 34 as suggested in FIG. 8. Thearrows 82 indicate the radially outward movement of the blade track 42.Once the first and retainer attachment posts 54, 56 are received, theretainer 50 is illustratively moved to its engaged position as indicatedby arrow 86 as suggested in FIG. 8. The positioner 46 is illustrativelymoved to its engaged position as indicated by arrow 84 such that theposition-setting surface 60 engages the track-positioning surface 58 tocouple the blade track 42 to the carrier 34.

The illustrative positioner 46 is moved by rotating the positioner 46such that positioner threads engage corresponding carrier threads tocause axial movement of the positioner 46. In some embodiments, theretainer 50 is moved by rotating the retainer 50 such that retainerthreads engage corresponding carrier threads to cause axial movement ofthe retainer 50.

In the illustrative embodiment, a bent-sheet seal 59 extends around theattachment posts 54, 56 and is arranged between the carrier 34 and therunner 52 of the blade track 42 as shown in FIGS. 3 and 4. The seal 59seals the cavity 48 from hot gasses passing over the runner 52 of theblade track 42. The seal 59 is received in a radially-inwardly openingchannel 69 formed in the carrier 34 and is itself formed to includelobes opening toward the cavity 48 so that pressure in the cavity 48pushes the seal into contact with the carrier 34 and the runner 52 ofthe blade track 42. Seal 59 may be full annular or may be made up of anumber of seal segments.

In the illustrative embodiment, the blade track 42 is formed of one ormore ceramic matrix composite (CMC) materials. In some embodiments, theCMC materials may include one or more of silicon carbide and oxides ofaluminum.

Referring now to FIG. 5, a second illustrative turbine shroud 228 isshown. The turbine shroud 228 is configured for use in engine 10 and issubstantially similar to the turbine shroud 28 shown in FIGS. 1-4 anddescribed herein. Accordingly, similar reference numbers in the 200series indicate features that are common between the turbine shroud 28and the turbine shroud 228. Further, the method of assembling theturbine shroud 228 is similar to the method of assembling the turbineshroud 28 described herein. The description of the turbine shroud 28 andits method of assembly are hereby incorporated by reference to apply tothe turbine shroud 228, except in instances when it conflicts with thespecific description and drawings of the turbine shroud 228.

Unlike the turbine shroud 28, a track attachment system 244 adapted foruse in a turbine shroud 228 of the engine 10 includes atrack-positioning surface 258 illustratively formed on a forward side ofthe positioner attachment post 254. The position-setting surface 260 isillustratively arranged on an opposite side of the positioner attachmentpost 254 from the positioner 246. In illustrative embodiments, when thepositioner 246 is in the engaged position contacting an aft side of thepositioner attachment post 254, the positioner attachment post 254 isurged in a direction away from the positioner 246 such that thetrack-positioning surface 258 engages the position-setting surface 260to couple the blade track 242 to the carrier 234 with ramped attachmentas suggested in FIG. 5.

Referring now to FIG. 6, a third illustrative turbine shroud 328 isshown. The turbine shroud 328 is configured for use in engine 10 and issubstantially similar to the turbine shroud 28 shown in FIGS. 1-4 anddescribed herein. Accordingly, similar reference numbers in the 300series indicate features that are common between the turbine shroud 28and the turbine shroud 328. The description of the turbine shroud 28 andits method of assembly are hereby incorporated by reference to apply tothe turbine shroud 228, except in instances when it conflicts with thespecific description and drawings of the turbine shroud 328.

Unlike the turbine shroud 28, a track attachment system 344 of theturbine shroud 328 of the engine 10 illustratively includes a retainer350 that is formed as a step integral with a carrier 334. The retainer350 is configured to contact an insert 380 of a retainer attachment post356 of the blade track 342 to block movement of the blade track 342 outof the cavity 348 when the positioner 346 is in the engaged position.The retainer attachment post 356 includes an end face 374 illustrativelythat extends both radially and axially at an angle. The end face 374 isconfigured for engagement with a face engagement surface 376 formed bythe carrier 334 to have an angle that is complimentarily to the angle ofthe end face 374 as suggested in FIG. 6.

Unlike the method of assembly of the turbine shroud 28, while thepositioner 346 of the turbine shroud 328 is in the disengaged position,the blade track 342 is moved radially outward such that the first andretainer attachment posts 354, 356 are received within theinwardly-opening cavity 348 of the carrier 334 as suggested in FIG. 9.The arrow 388 illustratively indicates the radially outward movement ofthe blade track 342 which includes an element of rotation in the forwarddirection. Once the first and retainer attachment posts 354, 356 arereceived, the positioner 346 is illustratively moved to its engagedposition as indicated by arrow 384 such that the position-settingsurface 360 engages the track-positioning surface 358 to couple theblade track 342 to the carrier 334.

Referring now to FIG. 7, a fourth illustrative turbine shroud 428 isshown. The turbine shroud 428 is configured for use in engine 10 and issubstantially similar to the turbine shroud 28 shown in FIGS. 1-4 anddescribed herein. Accordingly, similar reference numbers in the 400series indicate features that are common between the turbine shroud 28and the turbine shroud 428. The description of the turbine shroud 28 andits method of assembly are hereby incorporated by reference to apply tothe turbine shroud 228, except in instances when it conflicts with thespecific description and drawings of the turbine shroud 428.

Unlike the turbine shroud 28, a track attachment system 444 of theturbine shroud 428 of the engine 10 illustratively includes a retainer450 that is formed as a step integral with a carrier 434. The retainer450 is configured to contact an insert 480 of a retainer attachment post456 of the blade track 442 to block movement of the blade track 442 outof the cavity 448 when the positioner 446 is in the engaged position.The retainer attachment post 456 includes an end face 474 illustrativelythat extends both radially and axially at an angle. The end face 474 isconfigured for engagement with a face engagement surface 376 formed bythe carrier 434 to have an angle that is complimentarily to the angle ofthe end face 474 as suggested in FIG. 7.

Also unlike the turbine shroud 28, the track attachment system 444adapted for use in a turbine shroud 428 of the engine 10 includes atrack-positioning surface 458 illustratively formed on a forward side ofthe positioner attachment post 454. The position-setting surface 460 isillustratively arranged on an opposite side of the positioner attachmentpost 454 from the positioner 446. In illustrative embodiments, when thepositioner 446 is in the engaged position contacting an aft side of thepositioner attachment post 454, the positioner attachment post 454 isurged in a direction away from the positioner 446 such that thetrack-positioning surface 458 engages the position-setting surface 460to couple the blade track 442 to the carrier 434 with ramped attachmentas suggested in FIG. 7.

Unlike the method of assembly of the turbine shroud 28, while thepositioner 446 of the turbine shroud 428 is in the disengaged position,the blade track 442 is moved radially outward such that the first andretainer attachment posts 454, 456 are received within theinwardly-opening cavity 448 of the carrier 434 similar to that suggestedin FIG. 9. The arrow 388 illustratively indicates the radially outwardmovement of the blade track 442 which includes an element of rotation inthe forward direction. Once the first and retainer attachment posts 454,456 are received, the positioner 446 is illustratively moved to itsengaged position as indicated by arrow 384 such that theposition-setting surface 460 engages the track-positioning surface 458to couple the blade track 442 to the carrier 434.

The features of the present disclosure can simplify sealing and reduceface machining of plies in CMC components.

While the disclosure has been illustrated and described in detail in theforegoing drawings and description, the same is to be considered asexemplary and not restrictive in character, it being understood thatonly illustrative embodiments thereof have been shown and described andthat all changes and modifications that come within the spirit of thedisclosure are desired to be protected.

What is claimed is:
 1. A segmented turbine shroud that extends around acentral axis, the segmented turbine shroud comprising a carrier segmentthat extends partway around the central axis and that forms a radiallyinwardly-opening cavity, a blade track segment comprisingceramic-containing materials, the blade track segment formed to includea runner that extends partway around the central axis and a positionerattachment post that extends radially outward from the runner into theradially inwardly-opening cavity of the carrier segment, the positionerattachment post formed to include a track-positioning surface thatextends both radially and axially, and a track attachment system adaptedto couple the blade track segment to the carrier segment, and the trackattachment system including a positioner coupled to the carrier segmentto move axially from a disengaged position out of contact with thepositioner attachment post to an engaged position contacting thepositioner attachment post to engage the track-positioning surface ofthe positioner attachment post with a position-setting surface thatextends both radially and axially at an angle corresponding to that ofthe track-positioning surface.
 2. The segmented turbine shroud of claim1, wherein the position-setting surface is formed by the positioner. 3.The segmented turbine shroud of claim 2, wherein the positioner isformed to include positioner threads that engage corresponding threadsformed in the carrier segment.
 4. The segmented turbine shroud of claim1, wherein the position-setting surface is formed by the carriersegment.
 5. The segmented turbine shroud of claim 1, wherein the bladetrack segment includes a retainer attachment post that extends radiallyoutward into the radially inwardly-opening cavity of the carrier segmentfor arrangement within the inwardly-opening cavity of the carriersegment.
 6. The segmented turbine shroud of claim 5, wherein the trackattachment system includes a retainer coupled to the carrier segment tomove axially from a disengaged position arranged to allow radiallyoutward movement of the retainer attachment post into the radiallyinwardly-opening cavity of the carrier segment to an engaged positionarranged to block radially inward movement of the retainer attachmentpost out of the radially inwardly-opening cavity of the carrier segment.7. The segmented turbine shroud of claim 6, wherein the retainerattachment post has an L-shaped cross sectional profile, the L-shapedcross sectional profile includes a generally radially extending portionand a generally axially extending portion, and the retainer of the trackattachment system is arranged radially inward of the axially extendingportion when the retainer is in the engaged position.
 8. The segmentedturbine shroud of claim 5, wherein the track attachment system includesa step formed integrally with the carrier segment and arranged tocontact a radially inner surface of the retainer attachment post toblock radially inward movement of the retainer attachment post out ofthe radially inwardly-opening cavity of the carrier segment when thepositioner is in the engaged position.
 9. The segmented turbine shroudof claim 8, wherein the retainer attachment post has an L-shaped crosssectional profile, the L-shaped cross sectional profile includes agenerally radially extending portion and a generally axially extendingportion, and the step of the track attachment system is arrangedradially inward of the axially extending portion when the retainerattachment post is within the inwardly-opening cavity of the carriersegment.
 10. The segmented turbine shroud of claim 1, wherein thecarrier comprises a forward side wall, an aft side wall, a firstcircumferential end cap, and a second circumferential end cap thatcooperate to define the radially inwardly-opening cavity of the carriersegment, the first circumferential end cap is formed to include acircumferentially-opening strip-seal slot sized to receive a strip seal,and the second circumferential end cap is formed to include acircumferentially-opening strip-seal slot sized to receive a strip seal.11. A segmented turbine shroud that extends around a central axis, thesegmented turbine shroud comprising a carrier segment that extendspartway around the central axis and that forms a radiallyinwardly-opening cavity, a blade track segment comprisingceramic-containing materials, the blade track segment formed to includea runner that extends partway around the central axis and a retainerattachment post that extends radially outwardly into the radiallyinwardly-opening cavity of the carrier segment, and a track attachmentsystem adapted to couple the blade track segment to the carrier segment,the track retainer system including a retainer coupled to the carriersegment to move axially from a disengaged position arranged to allowradially outward movement of the retainer attachment post into theradially inwardly-opening cavity of the carrier segment to an engagedposition arranged to block radially inward movement of the retainerattachment post out of the radially inwardly-opening cavity of thecarrier segment.
 12. The segmented turbine shroud of claim 11, whereinthe retainer attachment post has an L-shaped cross sectional profile,the L-shaped cross sectional profile includes a generally radiallyextending portion and a generally axially extending portion, and theretainer of the track attachment system is arranged radially inward ofthe axially extending portion when the retainer is in the engagedposition.
 13. The segmented turbine shroud of claim 12, wherein theblade track segment includes a metallic insert that extends radiallyinward from the axially extending portion of the L-shaped crosssectional profile of the retainer attachment post and that is directlyengaged by the retainer of the track attachment system when the retaineris in the engaged position.
 14. The segmented turbine shroud of claim11, wherein the blade track segment includes a positioner attachmentpost that extends radially outward into the radially inwardly-openingcavity of the carrier segment, the positioner attachment post formed toinclude a track-positioning surface that extends both radially andaxially, and the track attachment system including a positioner coupledto the carrier segment to move axially from a disengaged position out ofcontact with the positioner attachment post to an engaged positioncontacting the positioner attachment post to engage thetrack-positioning surface of the positioner attachment post with aposition-setting surface that extends both radially and axially.
 15. Thesegmented turbine shroud of claim 14, wherein the position-settingsurface is formed by the positioner.
 16. The segmented turbine shroud ofclaim 14, wherein the position-setting surface is formed by the carriersegment.
 17. The segmented turbine shroud of claim 14, wherein theretainer attachment post has an L-shaped cross sectional profile, theL-shaped cross sectional profile includes a generally radially extendingportion and a generally axially extending portion, the axially extendingportion of the L-shaped cross sectional profile has an end face surfacethat extends both radially and axially, and the end face surface engagesan face engagement surface formed by the carrier segment that extendsboth axially and radially along an angle corresponding to that of theend face surface when the position is in the engaged position.
 18. Thesegmented turbine shroud of claim 11, wherein the carrier comprises aforward side wall, an aft side wall, a first circumferential end cap,and a second circumferential end cap that cooperate to define theradially inwardly-opening cavity of the carrier segment, the firstcircumferential end cap is formed to include a circumferentially-openingstrip-seal slot sized to receive a strip seal, and the secondcircumferential end cap is formed to include a circumferentially-openingstrip-seal slot sized to receive a strip seal.
 19. A method ofassembling a segmented turbine shroud that extends around a centralaxis, the method comprising moving a blade track segment formed toinclude a runner, a retainer post, and a positioner post radiallyoutward so that the retainer post and the positioner post are receivedin a radially inwardly opening cavity formed by a carrier segment, andattaching the blade track segment to the carrier segment with a trackattachment system by (i) contacting the retainer post with the carrier,and (ii) moving a positioner coupled to the carrier axially from adisengaged position out of contact with the positioner post to anengaged position contacting the positioner post to engage atrack-positioning surface of the positioner post with a position-settingsurface that extends both radially and axially at an angle correspondingto an angle of the track-positioning surface, by rotating the positionerrelative to the carrier segment so that positioner threads included inthe positioner engage corresponding threads formed in the carriersegment to cause axial movement of the positioner.
 20. The method ofclaim 19, wherein contacting the retainer post includes rotating aretainer of the carrier segment relative to the carrier segment so thatretainer threads included in the retainer engage corresponding threadsformed in the carrier segment to cause axial movement of the retainer.